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    <title>Document</title>
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        body {
            perspective: 1000px;  /* 视距 距离 眼睛到屏幕的距离  视距越大效果越不明显 视距越小，透视效果越明显 */
        }
        img {
            display: block;
            margin: 100px auto;
            transition: all 1s;
        }
        img:hover {
            transform: rotateY(360deg);
        }
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